Wireless sensor networking is an emerging technology, which supports many emerging applications due to their low cost, small size and untethered communication over short distances. Sensor nodes are deployed in open hostile environment in WSN applications. An adversary can easily compromise sensor nodes due to their unattended nature. Adversaries can inject false data reports into the WSN through compromised nodes. The false data reports lead the en-route nodes and the base station to make false decision. False decision depletes the energy of en-route nodes and the base station.